docs: def import_submodules(name, submodules=None):
      """Import all submodules for a package/module name"""
      sys.path.insert(0, name)
      if submodules:
          for submodule in submodules:
              import_string('{0}.{1}'.format(name, submodule))
      else:
          for item in pkgutil.walk_packages([name]):
              import_string('{0}.{1}'.format(name, item[1]))